Traditional BOLDERBoulder canceled in 2021, organizers setting up half-dozen other 10k run sites Denver7/BolderBoulder and last updated 2021-03-09 13:47:38-05 BOULDER, Colo. â For the second year in a row, the streets of Boulder will be quiet on Memorial Day. BOLDERBoulder organizers announced Monday that the 10k race will not be run in 2021, at least not in the traditional sense. âThe safety restrictions and safety precautions that still surround COVID-19, our individual planning timelines and unknowns surrounding both, have us in a situation that we wonât be able to pull off the in-person BOLDERBoulder or the traditional BOLDERBoulder this year,â race director Cliff Bosley said.